docs: def list_accounts_add(self, id, account_ids):
          """
          Add the account(s) given in `account_ids` to the list.
          """
          id = self.__unpack_id(id)
          
          if not isinstance(account_ids, list):
              account_ids = [account_ids]
          account_ids = list(map(lambda x: self.__unpack_id(x), account_ids))
          
          params = self.__generate_params(locals(), ['id'])        
          self.__api_request('POST', '/api/v1/lists/{0}/accounts'.format(id), params)